WallFlex Biliary Fully Covered (FC) Benign Stricture Study

Inclusion Criteria: * Age 18 or older * Willing and able to comply with the study procedures and provide written informed consent to participate in the study * Chronic pancreatitis or prior liver transplantation or prior other abdominal surgery (to include cholecystectomy) * Indicated for ERCP procedure with stent placement for: Symptomatic bile duct stricture (i.e. obstructive jaundice, persistent cholestasis, acute cholangitis) confirmed by cholangiogram and/or Bile duct stricture confirmed by cholangiogram and/or Exchange of prior plastic stent(s) for management of benign stricture Exclusion Criteria: General: * Placement of the stent in strictures that cannot be dilated enough to pass the delivery system * Placement of the stent in a perforated duct * Placement of the stent in very small intrahepatic ducts * Patients for whom endoscopic techniques are contraindicated * Biliary stricture of malignant etiology * Biliary stricture of benign etiology other than chronic pancreatitis or liver transplant anastomosis or other abdominal surgery * Stricture within 2 cm of duct bifurcation * Symptomatic duodenal stenosis (with gastric stasis) * Prior biliary self-expanding metal stent * Suspected stricture ischemia based on imaging of hepatic artery occlusion or endoscopic evidence of biliary cast syndrome * Known bile duct fistula * Known sensitivity to any components of the stent or delivery system * Participation in another investigational study within 90 days prior to consent or during the study Additional Specific to Chronic Pancreatitis Patients: * Developing obstructive biliary symptoms associated with an attack of acute pancreatitis Additional Specific to Post-Abdominal Surgery Patients: * History of hepatectomy * History of liver transplant Additional Specific to Liver Transplant Patients: * Live donor transplantation